Three pillars of exposure

Aperture
1.The eye
2.The smaller the aperture the less light gets in. The larger the aperture the more light that gets in.
3.The size of the aperture affects what in the picture looks sharp and what looks blurred.

Shutter Speed
1.a)High speed
   b)Medium speed
   c)Medium speed
   d)Slow speed
   e)Medium speed
   f)High speed
2.a)Slow speed
b)Slow speed
c) Slow speed
d)Slow speed
e)Slow speed
d)Medium speed
3.There is auto mode where the camera sets the aperture and shutter speed. In Aperture priority mode you set the shutter speed and the camera sets the aperture. In shutter priory mode you choose the aperture and the camera chooses the shutter speed. In manual you set both aperture and shutter speed.

Slow shutter speed

High shutter speed 

ISO
1.You don't need to use a flash, and it takes the picture quickly
2.Use the low ISO when there is light to get the best detail, if you use it at night and try to capture a fast picture its going to look like a ghost.
3.Use a high ISO when there is dim light and you are trying to capture a fast moving image.